<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=9; IE=8; IE=7; IE=EDGE">
<title>ajax四层级联示例（原则上无限级）</title>
<script src ="http://libs.baidu.com/jquery/1.9.0/jquery.js" ></script> 
<script type=text/javascript src=" get_ajax.js"></script>
</head>
<body >
所在区域：
<data id="area"></data>
<script>getarea(0,'area');</script>
</body>
</html>